One vertex per element, one color per generator, with an edge from x to x·s.
(3,4)(6,7)(9,10)(11,15)(12,13)(14,16)(17,18)(19,24)(20,25)(21,26)(22,23)(27,31)(28,29)(30,32) involution — undirected(1,2,5,8)(3,6,4,7)(10,13)(14,15)(18,23)(20,29)(24,31)(26,30)(1,3,5,4)(2,6,8,7)(9,10)(11,14)(12,13)(15,16)(19,27)(21,32)(24,31)(26,30)(9,11)(10,14)(12,16)(13,15)(17,19)(18,24)(20,30)(21,28)(22,27)(23,31)(25,32)(26,29) involution — undirected(1,2)(3,6)(4,7)(5,8)(17,20,22,29)(18,25,23,28)(19,26,27,30)(21,31,32,24)(1,4,5,3)(2,7,8,6)(17,21)(18,26)(19,28)(20,31)(22,32)(23,30)(24,29)(25,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.